an accepted standard or a way of behaving or doing things that most people agree with

Europe's varied cultural, political and ethical norms 欧洲形形色色的文化、政治和道德准则

accepted social norms 被认可的社会准则

a situation or type of behaviour that is expected and considered to be typical

One child per family is fast becoming the norm in some countries. 每个家庭一个孩子在一些国家正迅速普遍起来。